Control of a multi-sectored antenna system to improve channel efficiency

Abstract

A wireless device is coupled to a multi-sector antenna that includes a plurality of different sectors, any of which can be activated to transmit and receive in a desired direction specific to that sector. Optionally, an omnidirectional antenna is included for initially establishing a wireless connection with another wireless device, such as an access point. A parameter indicative of signal quality, such as throughput or received signal strength indication (RSSI) is determined by polling with each antenna sector to establish a prioritized candidate list. If a receive Trigger becomes active in response to a parameter falling below a threshold level, a new candidate sector is selected from the current list based upon a next-best signal quality. The directionality of the multi-sector antenna provides a substantially higher data rate compared to that of the conventional omnidirectional antenna.

Description

FIELD OF THE INVENTION[0001]The present invention generally pertains to control of an antenna used on a wireless network, and more specifically, to control of a multi-sector antenna that is coupled to a wireless device and can be controlled to communicate with another wireless device in a direction selected from a plurality of different directions.BACKGROUND OF THE INVENTION[0002]As an increasing number of computer users install wireless networks that meet the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specifications in their homes and workplaces, it has become apparent that the performance (i.e., range and data rate) of such systems often fails to meet their expectations. Structures built of stone or brick, or which contain blocking interior elements, such as a fireplace, mirror, refrigerator, or other large metal or masonry furnishings, often cause problems in achieving adequate RF coverage at a desired data throughput. Throughput can be very important when th...

AI Technical Summary

Benefits of technology

[0008]Thus, the present invention was developed to achieve the benefits of a directional antenna, without the problems noted above. Instead of using a plurality of different directional antennas and a different transceiver for each directional antenna, the present invention selectively controls the direction used for communication by employing a multi-sector antenna that is steerable in regard to the direction in which it transmits and receives RF wireless signals. This antenna is electronically steered so that a selected sector is activated (or so that the beam of the antenna is steered in a selected direction). The selected sector then transmits and receives in this direction, which is defined by a phased array antenna disposed on the sector. By selecting the sector associated with a direction that provides the optimal signal strength or some other criterion that is indicative of signal quality, it is possible to achieve a much higher data rate than is possible when transmitting or receiving in all directions at the same time (for a given transmit power). The direction in which communications occur can thereby be dynamically controlled to enable streaming video or other data that requires a higher data rate to be effectively communicated to or from the wireless device.

Problems solved by technology

As an increasing number of computer users install wireless networks that meet the Institute of Electrical and Electronics Engineers (IEEE) 802.11 specifications in their homes and workplaces, it has become apparent that the performance (i.e., range and data rate) of such systems often fails to meet their expectations.

Structures built of stone or brick, or which contain blocking interior elements, such as a fireplace, mirror, refrigerator, or other large metal or masonry furnishings, often cause problems in achieving adequate RF coverage at a desired data throughput.

Also, the reception at a client device can be disrupted as a person or other object moves through the signal path to the access point, or if the client device, which is often a laptop or other portable computing device, moves even a few centimeters.

However, these buffers cause a lag in the media data feed (latency), increase memory requirements, and generally make a wireless system more complex than is necessary.

Frequently, the only way to achieve a desired coverage and throughput in an office or home is to add more access points so that the distance and / or intervening structural elements between the access points and the clients devices are reduced, which means higher wiring costs to run Ethernet cabling to the additional access points and greater equipment costs for each added access point.

Increasing transmitter power is typically not an option due to regulatory limitations and / or because significantly increased power consumption is not acceptable for a battery powered side of a link.

However, the direction in which the RF energy needs to be transmitted or received is not fixed in most wireless systems, because a fixed access point must be able to maintain communications with moving client devices, or communicate with client devices that are located at different positions scattered around the access point.

Such systems are generally too costly for home or small business use, however.

Unfortunately, these systems are typically large and very expensive, and consequently, have generally not appeared in consumer products.

This technology is also beginning to appear in commercial access points intended for installation in large scale commercial applications, such as at airports or in universities, but suitable systems still cost thousands of dollars.

Images